EvaKool DOWN UNDER Series, Service Manual

DOWN UNDER

 SERIES

17

From a service and warranty point of view, the circuit breakers can fail, so make sure this 

component is tested . 

Handy Hint:

Where there is a drop in voltage there is HEAT so feel the components and 

visually check for signs of heat; burning, black terminal covers, tainted metal on connectors 

etc.  

Important: 

These tests must be done under load (with compressor running), there will be no 

voltage drop if the system is not under load. 

Note:

 The cutout voltage is measured at the Secop control module. As a rule of thumb there 

will be approximately 0.5 to 0.8 Volt of losses through the wiring and connectors and circuit 

breaker inside the unit, this does not include the losses in the customers wiring set-up.

Example:

 The unit is set on high battery protection, which is 11 .1 V cutout at the 

compressor, with losses in the fridge (wiring, connections, circuit breaker) of 0 .8 Volts, 

this is now showing the fridge cutting out at 11 .9 Volts at the battery . Now if we include 

the lead we supply, the connection in the customers car and the 5 to 6 metres of cable 

from the secondary battery to the fridge this could equate to another 1 to 2 Volts of losses 

between the battery and the compressor module, NOW we would measure around 12 .9 or 

13 .9 at the battery and the fridge is cutting out .

These figures are conservative standard resting 12 V battery charge:

•  12 .8 volts = 100%  

•  12 .5 volts = 70%

•  12 .3 volts = 50%

•  11 .4 volts = 20%

At the Battery:

 12 .8 Volts minus 1 .5 Volts for customers wiring and connections . 

At the Anderson connector on the fridge:

 11 .3 Volts minus 0 .8 Volts of losses inside the 

cabinet .

At the Secop module on compressor:

 10 .5 Volts   

You can see in this example that the fridge will not start at all in High or Medium battery 

monitor mode . 

Battery Monitor Mode

L

M

H

Switch-off voltage at 12V

10 .1V

10 .5V

11 .1V

Restart voltage at 12V

10 .9V

11 .4V

12 .4V

Switch-off voltage at 24V

21 .5V

22 .3V

24 .3V

Restart voltage at 24V

22 .7V

23 .7V

25 .7V